O. Godinot, M. Carof, F. Vertès, and P. Leterme, SyNE: An improved indicator to assess nitrogen efficiency of farming systems, Agricultural Systems, vol.127, pp.41-52, 2014.
DOI : 10.1016/j.agsy.2014.01.003

URL : https://hal.archives-ouvertes.fr/hal-01209218

M. Carof and O. Godinot, A free online tool to calculate three nitrogen-related indicators for farming systems, Agricultural Systems, vol.162, pp.28-33, 2018.
DOI : 10.1016/j.agsy.2018.01.015

, Council Directive 91/676/EEC concerning the protection of waters against pollution caused by nitrates from agricultural sources, O.J. L, vol.375, 1991.

, Available from ?https, 2018.